HP 7475A Service Manual page 3

Table of Contents Model 7475A
TABLES (Continued)
Table Page
Table Page
4-6. Reference Designations and
5-3. Date Codes
............................
5-1
Abbreviations
o 0 0 0 0 I 0 0 0 0 o o o oo o o o o o o o o
4-12 6-1.
RS-232-C/CCITT V.24 Interface Signal
5-1. Assemblies by Plotter Serial Number Levels ··················· ............
6-2
Prefix
................................
5-1 6-2. Recommended Test Equipment .........
6-7
5-2. Item Description
.......................
5-1 6-3. Troubleshooting
·············· .........
6-8
ILLUSTRATIONS
1-1. Model 7475A . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-0
1-2. Top Case Removal . .. . . . . . . . . . . . . . . . . . . 1-3
1-3. Line Voltage Selection . . . . . . . . . . . . . . . . . 1-4
1-4. Power Cord Configurations . . . . . . . . . . . . 1-5
2-1. Pl and P2 Button and Power Switch
Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-2. Demonstration Plot . . . . . . . . . . . . . . . . . . . . 2-5
2-3. Test Program . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2-4. Features Test Plot . . . . . . . . . . . . . . . . . . . . . 2-9
2-5. Repeatability Test Points . . . . . . . . . . . . . . 2-10
4-1. Model 7475A Exploded View . . . . . . . . . . . 4-9
4-2. Pen Carousel Parts . . . . . . . . . . . . . . . . . . . . 4-10
6-1. 7475A Simplified Block Diagram . . . . . . . 6-1
6-2. RS-232-C/CCITT V.24 Interface
Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.-3. HP-IB Interface Circuits and Handshake
Timing Diagram . . . . . . . . . . . . . . . . . . . . . 6-4
6-4. Quadrature Waveforms . . . . . . . . . . . . . . . . 6-6
6-5. Motor Servo System Block
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6-6. Drive Signal · .ses . . . . . . . . . . . . . . . . . . . . 6-9
6-7. Top Case Ret._Jval . . . . . . . . . . . . . . . . . . . . . 6-9
6-8. Pen Carousel Cable . . . . . . . . . . . . . . . . . . . . 6-9
11
6-9. Pen Carousel Housing . . . . . . . . . . . . . . . . . 6-10
6-10. Paper Drive Motor and Solenoid
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6-11. Paper Drive Motor Clamp and Pen Drop
Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6-12. Paper Drive Coupler Parts . . . . . . . . . . . . . 6-11
6-13. Pen Solenoid and Pen Drive . . . . . . . . . . . . 6-12
6-14. Pen Drive Tensioner . . . . . . . . . . . . . . . . . . . 6-12
6-15. Pen Carriage . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
6-16. Measuring Pen Down Force . . . . . . . . . . . . 6-14
6-17. Pinch Rollers . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
6-18. Chassis Assembly Removal . . . . . . . . . . . . 6-14
6-19. Underside of Chassis Assembly . . . . . . . . 6-15
6-20. Power Module Removal . . . . . . . . . . . . . . . . 6-16
6-21. Power Module Wiring . . . . . . . . . . . . . . . . . . 6-17
6-22. Schematic Diagram Notes . . . . . . . . . . . . . 6-18
6-23. ANSI Y32.14 Logic Symbols . . . . . . . . . . . 6-20
6-24. RS-232-C, Option 001 Schematic
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27
6-25. HP-IB, Option 002 Schematic
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29
6-26. Power Supply, Schematic
Diagram ..................... , . . . . . . 6-31